Tool driver attachment



Nov. 2, 1965 FIGJ O. E. DIETRICH TOOL DRIVER ATTACHMENT Original FiledAug. 4, 1959 II I l O n '2 m; i G n? .g m I0. 10%} 3, 8% 2:

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INVENTOR.

BY OTTO E. D/ETR/GH United States Patent 3,214,992 TOOL DRIVERATTACHMENT Otto E. Dietrich, 617 W. Jackson St., Morton, Ill. Originalapplication Aug. 4, 1959, Ser. No. 831,530, now Patent No. 3,004,569,dated Oct. 17, 1961. Divided and this application Sept. 11, 1961, Ser.No. 137,312

2 Claims. '(Cl. 74-425) This invention relates to tool driverattachments and particularly to attachments to be driven by a smallportable electric drill and like sources of power. This is a division ofmy application entitled Power Driven Screw Driver, filed Aug. 4, 1959,Ser. No. 831,530, now Patent No. 3,004,569.

It is an object of this invention to provide an improved tool driverattachment which is simple in construction, with the axis of rotation ofthe tool being angularly disposed with respect to the axis of rotationof the source of rotary power.

It is a further object of this invention to provide an improved tooldriver attachment so that the torque of the driven tool can becontrolled by the amount of pressure the operator applies.

Another object is to provide a tool driver attachment which employs wormgearing to greatly reduce the speed in a single step and at the sametime increase the torque of the driven tool.

Additional features and advantages of the invention will be found byreferring to the drawings in which:

FIG. 1 is a top plan view of the tool driver attachment, the driven toolshown here as a screw driver bit, however the tool could as well be asocket wrench, a drill bit, etc.

FIG. 2 is a sectional view of the attachment taken along line 2-2 ofFIG. 1.

FIG. 3 is a sectional view showing the driving worm and the driven wormgear setup, taken along line 3-3 of FIG. 2.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 2.

FIG. 5 is a sectional view taken along line 5-5 of FIG. 2 and is thesame section as FIG. 4 except the view is in the opposite direction.This shows the end view of the jaw portion of the clutch of the wormgear.

FIG. 6 is a detail view of the worm gear showing the clutch section.

FIG. 7 is an end view of the drive socket used to couple the tool driverattachment to a source of power.

FIG. 8 illustrates a side view of the socket shown in FIG. 7.

FIG. 9 is a partially sectional View of the socket taken along line 9-9of FIG. 7 and FIG. 8.

The tool driver attachment as shown in FIG. 1 has a hollow body 10 towhich is attached the knurled handle 11. The body and handle extendsymmetrically along a common longitudinal axis indicated in FIG. 1 asline 2-2.

The driven tool 12 shown in FIG. 1 as a screw driver bit, is fastened inthe chuck which is driven by the worm gearing within the body 10. Thetwo extensions 13 and 14 are the ends of the driven shaft on which isthe worm 15. These extensions and worm are shown more clearly in FIG. 3.The drive socket 16 is shown in FIGS. 7, 8, 9 and also FIG. 1. It isfastened in the chuck of an electric drill by the shaft end portion 17and then slipped over one of the extensions 13 or 14 to drive theattachment. Shown in FIG. 9 is a drilled hole 18 to receive theextensions 13 or 14 and in FIG. 8 the groove 19 for the pins 20 or 21.Also shown in FIG. 8 is a leaf spring formed from the socket 16, with adetent portion at 22. As the socket is slipped over the extention 13 or14 the 3,214,992 Patented Nov. 2, 1965 pin 20 or 21 is retained in thegroove 19 by the detent effect of the leaf spring.

In FIG. 2 is shown the complete drive mechanism in cross section. Thedriving worm 15 is enmeshed with the driven worm gear 23. At 24 is shownthe clutch jaw section of this worm gear. The chuck portion of the drivemechanism is shown at 25 and is supported and retained in the body 10 bythe sleeve 26, which is locked in place by the set screw 27.

The chuck 25 has a clutch jaw section shown at 28 in FIG. 2 and FIG. 5,which mates with the clutch section 24 of the worm 23. These clutch jawsare preferably made with their mating edges at a slight angle as shownat 32 in FIG. 6 so the clutch will be forced apart or disengaged underpressure. The torque of the tool is then determined by the amount ofpressure the operator applies to the handle to keep the clutch fromdisengaging. A pin- 29 is provided in chuck 25 for driving the bit 12 orwhatever tool is being used. The lock nut 30 fastens the tool to thechuck. A ball bearing 31 supports the worm gear and also serves as athrust bearmg.

To operate this attachment, a tool such as the screw driver bit 12, isslipped in the chuck and the nut 30 is tightened to fasten the bit inplace. The drive socket 16 is clamped in the chuck of a drill, if thisis the power source being used, and the socket slipped over theextension 13 or 14, depending on the direction the tool should turn. Theextension 13 or 14 can be clamped directly in the chuck of a drill ifthis is desirable, the drive socket being used whehn it is necessary tofrequently reverse the direction of the tool while in use. Then as thedrill is rotating under power, the screw driver bit will not rotatebecause the spring 33 has the clutch disengaged, however when theoperator places the bit in the slot of a screw and applies pressure tothe handle 11, the spring force is overcome and the bit rotates. As thescrew tightens, the pressure on the clutch becomes greater and will slipout of engagement, if the pressure on the handle is not great enough toprevent this. This clutch action is a safety feature to prevent the headof the screw from breaking. To drive the screw in tighter the operatorapplies more pressure to the handle.

What I claim is:

1. A tool driver attachment for coupling a unidirectional source ofrotary power to a tool to be driven thereby, comprising:

a hollow body having a longitudinal axis,

a driving worm rotatably mounted in said body transversely thereto,

drivable extensions attached to each end of said worm and extendingoutwardly from said body,

each of said extensions adapted to be coupled to said source of rotarypower,

a worm gear rotatably mounted in said body on said longitudinal axis andmeshing with said worm,

a chuck for engaging a tool rotatably and axially slidably retained insaid body,

clutch jaws on each of said worm gear and said chuck complementarilyshaped for mating engagement,

and spring means interposed between said chuck and said worm gear fornormally urging said clutch jaws apart, whereby said chuck can berotated in either direction by a source of rotary power which is capableof rotating in only one direction.

2. A tool driver attachment as defined in claim 1, including atransverse driving pin secured to each of said extensions, a drivesocket adapted on one end to be connected to said power source, and onthe other end adapted to be slipped over one of said extensions, a slotin said socket to receive said driving pin, and a detent .2,857,99710/58 Graybill 192.34

3 v 4 formed on said socket for engaging said driving pin to 2,950,6268/60 Short. secure the socket to the extension. 3,004,569 10/61 Dietrich14432 FOREIGN PATENTS References Cited by the Examiner 684,754 7/30France.

, V v r UNITED STATES PATENTS 0 485,885 11/29 Germany.

2,429,569 10/ 47 Stewart 8157 2,613,241 11/ 52 Lafcell et DON A. WAITE,Primary Examiner.

2,790,471 4/57 Graybill 144--32 BROUGHTON G. DURHAM, Examiner.

1. A TOOL DRIVER ATTACHMENT FOR COUPLING A UNIDIRECTIONAL SOURCE OFROTARY POWER TO A TOOL TO BE DRIVEN THEREBY, COMPRISING: A HOLLOW BODYHAVING A LONGITUDINAL AXIS, A DRIVING WORM ROTATABLY MOUNTED IN SAIDBODY TRANSVERSELY THERETO, DRIVABLE EXTENSIONS ATTACHED TO EACH END OFSAID WORM AND EXTENDING OUTWARDLY FROM SAID BODY, EACH OF SAIDEXTENSIONS ADAPTED TO BE COUPLED TO SAID SOURCE OF ROTARY POWER, A WORMGEAR ROTATABLY MOUNTED IN SAID BODY ON SAID LONGITUDINAL AXIS ANDMESHING WITH SAID WORM, A CHUCK FOR ENGAGING A TOOL ROTATABLY ANDAXIALLY SLIDABLY RETAINED IN SAID BODY, CLUTCH JAWS ON EACH OF SAID WORMGEAR AND SAID CHUCK COMPLEMENTARILY SHAPED FOR MATING ENGAGEMENT, ANDSPRING MEANS INTERPOSED BETWEEN SAID CHUCK AND SAID WORM GEAR FORNORMALLY URGING SAID CLUTCH JAWS APART, WHEREBY SAID CHUCK CAN BEROTATED IN EITHER DIRECTION BY A SOURCE OF ROTARY POWER WHICH IS CAPABLEOF ROTATING IN ONLY ONE DIRECTION.